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Jan 20, 2007 | 05:50 AM

JRT32615

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engine running rough

I have 2003 F-150 Super crew 4x4 with 5.4 engine with 66,000 miles Started running like it was on 4 cylinders yesterday. Replaced air filter and fuel filter and it helped but is still running rough. Any ideas? The service engine light also came on

Last edited by JRT32615; Jan 20, 2007 at 06:03 AM.

Jan 20, 2007 | 06:23 AM

96sherm

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From: Yorkton Sask

since your engine light came on, it would be your best bet to get the truck on a code reader. that will narrow down the source of the poor running. chances are that its a coil(#4) or plug. there are many awesome dudes here that can explain your codes for you!!!

sherm

Jan 20, 2007 | 06:38 AM

JRT32615

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Thanks for info. I read in another thread Autozone might hook up and read codes for you. Can anyone confirm this?

Jan 20, 2007 | 07:38 AM

Joe Finn

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Yes, most parts stores will read the codes for free. Make sure you get the actual code and not just the "words". i.e. P0401

Jan 20, 2007 | 08:18 PM

JRT32615

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Thanks to everone for their help. I am up and running again!!!

Jan 20, 2007 | 10:22 PM

96sherm

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From: Yorkton Sask

may we hear the solution for future reference?? what was the sickness...what was the cure?

sherm...

Jan 21, 2007 | 03:02 AM

JRT32615

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Took truck to Autozone code was P0303 indicating problem with #3 cylinder. Purchased Duralast coil pak and Motorcraft spark plug. Inadvertently installed in #2 instead of #3 and returned to Autozone for another reading. Came back with two codes P0303 and P0352. Returned home and noticed mistake and changed #2 back to original parts and installed new parts in #3. I noticed the plug in #3 had a gap of .085 instead of recommended gap of .052-.056 I am wondering if that was the problem all along. Will take the original coil pak in to be tested later today. Problem solved by replacing parts in #3 cylinder